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<?php class foo { private $private = 'private'; protected $protected = 'protected'; public $public = 'public'; } class bar extends foo { public function __sleep() { return array("\0foo\0private", '\0*\0protected', 'public'); } } var_dump(str_replace("\0", '\0', serialize(new bar())));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: serialize(): "\0*\0protected" returned as member variable from __sleep() but does not exist in /in/7lDpA on line 18 string(76) "O:3:"bar":2:{s:12:"\0foo\0private";s:7:"private";s:6:"public";s:6:"public";}"
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: serialize(): "\0*\0protected" returned as member variable from __sleep() but does not exist in /in/7lDpA on line 18 string(100) "O:3:"bar":3:{s:12:"\0foo\0private";s:7:"private";s:14:"\0*\0protected";N;s:6:"public";s:6:"public";}"
Output for 5.0.0 - 5.0.4, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 7.3.32 - 7.3.33, 7.4.26
string(100) "O:3:"bar":3:{s:12:"\0foo\0private";s:7:"private";s:14:"\0*\0protected";N;s:6:"public";s:6:"public";}"
Output for 5.0.5

Process exited with code 139.
Output for 4.4.2 - 4.4.9
<br /> <b>Parse error</b>: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/7lDpA</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
<br /> <b>Parse error</b>: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/7lDpA</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in <b>/in/7lDpA</b> on line <b>5</b><br />
Process exited with code 255.
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278.2 ms | 401 KiB | 456 Q